I have a 98 cherokee with a P1698 Fault Code. This issue came up after swapping the engine out. When the TCM is plugged in the Speed o meter doesnt work. But when it is unplugged it works properly. The trannsmission is stuck in high gear (over drive) at all times. I tried swapping out the tranny but this didnt correct the problem. Could anyone point me in the right direction before I spend anymore money on my project.

The flywheel is the original one. What i did is rebuilt the motor myself. No I don't have the factory service manual. The transmission shifts strong manually. All conections from the tcm and ecm read fine. Ive also replaced the speed senor recently.

Shifting normally when shifted manually points more toward an electrical issue. Since you recently performed major repairs, the logical starting point is confirming everything is correctly installed, correctly connected, and that no wires or components were damaged during the work.

Consider a used TCM from the junkyard as they cannot be easily tested. Otherwise, test and inspect for faulty/damaged transmission sensors, speedometer sensor, Neutral Safety Switch (NSS), or damaged wires.

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This is what I figured an electical issue. I thought if the transmission shifted normally manually that it couldn't be mechanical. I will trouble shoot what I can. I willing to bet some wires got damaged during the engine installation. I'll let you know what I find. Thank you for the help.